<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" version="2.0">
  <channel>
    <title>topic Re: Disk I/O in Virtual Machine, Guest OS and VM Tools Discussions</title>
    <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317830#M7179</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;You will need to find out where the latency resides. Where are you seeing the 500ms latency?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Also, check for SCSI communication errors on the vmkernel logs, sometimes the problem resides on a bad cable/switch port.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Wed, 23 May 2012 00:40:16 GMT</pubDate>
    <dc:creator>marcelo_soares</dc:creator>
    <dc:date>2012-05-23T00:40:16Z</dc:date>
    <item>
      <title>Disk I/O</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317828#M7177</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hello, I've just take over a VMware VSphere environment that there are some points I would like share them here.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;sometimes a BD Oracle become slow. this BD is installed on an VM Windows 2008 R2. I've looked in performance disk and sometimes the time of that disk arrives in 500 ms I think it's a longer time.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;so... I'm afraid that structure of connections beetwen VMware Hosts ( there are two in cluster ) and storage doesn't be way recommend.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;there is only an connection ISCSI SAN between each VMware host and storage. each host has 12 VMs.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;What do you think about only one connection with storage ? it's few ? if I put more one connection for each host VMware maybe I'll sense more speed !??!&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;thanks&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 22 May 2012 18:49:33 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317828#M7177</guid>
      <dc:creator>maiconlp</dc:creator>
      <dc:date>2012-05-22T18:49:33Z</dc:date>
    </item>
    <item>
      <title>Re: Disk I/O</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317829#M7178</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;One connection 1 Gbps is not sufficient. In many case the entry level solution propose two Gbps commections for each host.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;--&lt;/P&gt;&lt;P&gt;Rocco Sicilia&lt;/P&gt;&lt;P&gt;&lt;A class="jive-link-external-small" href="http://www.roccosicilia.it/"&gt;http://www.roccosicilia.it&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 22 May 2012 20:40:56 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317829#M7178</guid>
      <dc:creator>rsicilia</dc:creator>
      <dc:date>2012-05-22T20:40:56Z</dc:date>
    </item>
    <item>
      <title>Re: Disk I/O</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317830#M7179</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;You will need to find out where the latency resides. Where are you seeing the 500ms latency?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Also, check for SCSI communication errors on the vmkernel logs, sometimes the problem resides on a bad cable/switch port.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 23 May 2012 00:40:16 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317830#M7179</guid>
      <dc:creator>marcelo_soares</dc:creator>
      <dc:date>2012-05-23T00:40:16Z</dc:date>
    </item>
    <item>
      <title>Re: Disk I/O</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317831#M7180</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi, thanks.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;DIV class="jive-rendered-content"&gt;&lt;P&gt;You will need to find out where the latency resides. Where are you seeing the 500ms latency?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; A: sorry, it was 150ms. I saw in vmware performance manager for that machine. in my guest S.O ( Win2k8 r2 ) shows some high I/O too&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Also, check for SCSI communication errors on the vmkernel logs, sometimes the problem resides on a bad cable/switch port.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;where is vmkernel logs ? I can't find it in the Vcenter manager. there isn't any alarm about that issue in vcenter manager.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;thanks&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/DIV&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 23 May 2012 03:22:39 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317831#M7180</guid>
      <dc:creator>maiconlp</dc:creator>
      <dc:date>2012-05-23T03:22:39Z</dc:date>
    </item>
    <item>
      <title>Re: Disk I/O</title>
      <link>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317832#M7181</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;DIV class="jive-rendered-content"&gt;&lt;P&gt;where is vmkernel logs ? I can't find it in the Vcenter manager. there isn't any alarm about that issue in vcenter manager.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;thanks&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;In Esx, the vmkernel log will reside in /var/log/vmkernel&lt;/P&gt;&lt;P&gt;In ESXi, the vmkernel log will be merged in to /var/log/messages and also you can see vmkernel only logs by pressing Alt+f12 in the idle screen of the ESXi server&lt;/P&gt;&lt;/DIV&gt;&lt;/BLOCKQUOTE&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 25 May 2012 08:43:54 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Virtual-Machine-Guest-OS-and-VM/Disk-I-O/m-p/317832#M7181</guid>
      <dc:creator>zXi_Gamer</dc:creator>
      <dc:date>2012-05-25T08:43:54Z</dc:date>
    </item>
  </channel>
</rss>

